Concrete laminated slab

Abstract

The utility model provides a concrete laminated slab, which belongs to the field of fabricated buildings and comprises a bottom plate, longitudinal combined ribs and a cast-in-place layer. Wherein the longitudinal combined rib is arranged on the bottom plate and formed on the plate surface of the bottom plate, the longitudinal combined rib at least comprises two concrete rib sections and a steel rib section, the steel rib section is connected between the two concrete rib sections to form a full-length structure, and the steel rib section is located on the middle point of the plate length of the bottom plate, symmetrically extends towards the two ends and accounts for 2 / 3 of the total plate length; a pipe penetrating space is formed in the steel rib section; and the cast-in-place layer is cast on the bottom plate on a construction site and at least covers the concrete rib section and the steel rib section. According to the scheme, the longitudinal combined ribs of the concrete rib sections and the steel rib sections are arranged, and due to the fact that the compression resistance, especially the tensile strength, of steel is far larger than that of concrete, although the sectional area of the steel rib sections is far smaller than that of the concrete rib sections, the compression resistance and tensile bearing capacity is not reduced; therefore, sufficient pipe penetrating space can be provided, and the shear resistance effect of the structure can be kept.

Description

Technical Field

[0001] The utility model belongs to the field of assembled buildings, and in particular relates to a concrete composite slab. Background Art

[0002] Concrete rib composite slabs have been tried to be applied in the field of prefabricated buildings due to their advantages such as good vertical stiffness, convenient construction and cost saving. However, there are still the following problems that hinder their large-scale promotion:

[0003] Due to the existence of ribs, there are great problems in the on-site laying of electromechanical pipelines. The existing technology generally directly opens holes on the ribs, but the low strength of the concrete ribs limits the size of the holes and affects the shear and compression resistance of the ribs.

[0004] Since the concrete ribs and the bottom plate are cast in two layers, they are easy to peel off during transportation and construction.

[0005] The bearing capacity of the floor slab in the direction perpendicular to the ribs is poor, and cracks along the ribs are prone to occur;

[0006] Therefore, this application arises as the times require. Utility Model Content

[0007] One purpose of the utility model is to provide a concrete rib composite plate which is convenient for threading and laying pipes;

[0008] The second object of the utility model is to provide an ultra-wide concrete composite slab without longitudinal cracking;

[0009] In order to solve at least one of the above purposes, the utility model first provides a concrete composite slab, characterized in that it includes:

[0010] Base plate;

[0011] A longitudinal composite rib, the longitudinal composite rib is arranged on the bottom plate and formed on the plate surface of the bottom plate, the longitudinal composite rib comprises at least two concrete rib sections and one steel rib section, the steel rib section is connected between the two concrete rib sections to form a through-length structure; the steel rib section is located with the midpoint of the plate length of the bottom plate as the reference, and extends symmetrically to both ends within a range of 2 / 3 of the total plate length; a pipe penetration space is formed in the steel rib section;

[0012] A cast-in-place layer is cast on the base plate at the construction site and covers at least the concrete rib segment and the steel rib segment.

[0013] Preferably, it further comprises a transverse frame, the bottom of which is buried in the bottom plate, and the top of which is straddling the steel rib segment and / or the concrete rib segment.

[0014] Preferably, the concrete rib segment includes a longitudinal concrete rib structural rib and a longitudinal concrete rib, the longitudinal concrete rib is formed on the plate surface of the base plate through the longitudinal concrete rib structural rib, and the longitudinal concrete rib structural rib is connected to the longitudinal concrete rib and the base plate.

[0015] Preferably, the transverse frame includes at least an upper chord and a web; in the transverse frame spanning the concrete rib segment, the web forms a web avoidance opening at the concrete rib segment; the web avoidance opening can at least be passed by the casting side form of the concrete rib segment.

[0016] Preferably, the web member is partially buried in the longitudinal concrete rib at the web member avoidance opening.

[0017] Preferably, the steel rib segment is an inverted U-shaped steel plate, both ends of the inverted U-shaped steel plate are respectively fixed with bolts, and the two ends of the inverted U-shaped steel plate are respectively connected to the concrete rib segment through the bolts; the pipe penetration space is formed in the U-shaped space of the inverted U-shaped steel plate.

[0018] Preferably, the elevation of the steel rib segment is higher than that of the concrete rib segment.

[0019] Preferably, both ends of the inverted U-shaped steel plate are implemented as end molds of the concrete rib segment.

[0020] The technical effects of the above technical solution of the utility model come from one or more of the following combinations:

[0021] The present application arranges longitudinal composite ribs of concrete rib segments and steel rib segments, forms a larger pipe-passing space through the steel rib segments, and improves the compression or tension resistance, thereby maintaining the consistency of the bearing capacity of the composite plate ribs, so that the composite plate will not have a reduced bending resistance at the pipeline crossing point, thereby achieving the characteristics of providing sufficient pipe-passing space while maintaining the composite plate structure without weak bending links.

[0022] A transverse frame and longitudinal combined ribs can be arranged to form a two-way plate. The bottom of the web of the transverse frame is hooked on the structural reinforcement of the bottom plate, eliminating the need for steel bars for the lower chord. In addition to saving steel, it realizes the operable installation of the transverse frame (if there is a lower chord, the installation and positioning cannot be completed due to the obstruction of the longitudinal reinforcement of the floor slab).

[0023] The shear force of the composite slab is large at both ends and small in the middle; the steel rib section is arranged in the area on the bottom plate where the shear force is smaller than the end (i.e., symmetrical about the midline as described in this article and within the range of no more than 2 / 3 of the total slab length), that is, close to the middle, which just matches the characteristics of the inverted U-shaped rib having better longitudinal force transmission capacity along the floor slab but poor vertical shear resistance.

[0024] The transverse frame can span the steel rib section and the concrete rib section. When spanning the concrete rib section, the web member of the transverse frame is partially buried in the concrete rib section to form a tie. At the same time, the web member forms a web member avoidance to facilitate the side formwork support for the pouring of the concrete rib section. When spanning the steel rib section, the web member is located exactly in the inverted U-shaped groove of the steel rib.

[0025] The steel rib segment is fixed to two adjacent concrete rib segments by bolts. When the concrete rib segment is poured, the steel rib segment can be used as an end form of the concrete rib segment.

[0026] The steel rib section is an inverted U-shaped steel plate. The top can play a compressive or tensile role. The two sides serve as the end molds of the concrete rib section. The internal space naturally forms a pipe-through space, and the space is sufficient for the arrangement of conventional pipelines. It is convenient for pipelines to pass through at a certain angle, unlike the traditional concrete ribs that can only be opened in a straight line perpendicular to the rib direction; it is more convenient for wiring. For example, for a conventional 130mm floor slab, the bottom plate thickness is 35mm, the rib top space is 25mm, and the steel plate thickness is 10mm, then the pipe-through space can reach 60mm. However, due to the need to maintain the continuity of the force transmission of the concrete ribs, the pipe-through space of conventional concrete rib composite slabs can only be opened at a height of 30mm. The actual pipe-through difficulty on site is very high, resulting in the inability to promote the use of conventional (truss-free) concrete rib slabs.

[0027] Compared with the traditional concrete rib composite slab, the steel frame of the present application connects the bottom plate with the secondary poured concrete ribs, preventing the concrete ribs from peeling off from the bottom plate; at the same time, the setting of the transverse frame makes the composite slab have a strong transverse bending resistance, and can produce composite slabs with a width of more than 4m, avoiding the occurrence of floor joints in the room. The width of conventional composite slabs generally does not exceed 3m, which cannot reach the width of the room span, resulting in floor joints in the room. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The schematic diagram of the structure of the prefabricated part of the concrete composite slab of the utility model is expressed.

[0029] Figure 2 The invention expresses the reinforcement schematic diagram of the longitudinal composite ribs, the transverse frame and the bottom plate in the concrete composite slab.

[0030] Figure 3 Expressed Figure 2 A magnified view of the part A.

[0031] Figure 4 Another structural schematic diagram of the prefabricated part of the concrete composite slab of the utility model is expressed.

[0032] Figure 5 Expressed Figure 4 Enlarged view of part B.

[0033] Figure 6Another perspective schematic diagram of reinforcement of the longitudinal composite ribs, transverse frames and bottom plate in the concrete composite slab of the utility model is expressed.

[0034] Figure 7 Expressed Figure 6 Enlarged view of the C portion of the image.

[0035] Figure 8 Expressed Figure 6 Enlarged view of the D part of .

[0036] Fig. 9 A front schematic diagram of the concrete composite slab of the utility model is expressed.

[0037] Fig.10 A structural schematic diagram of the steel rib section in the utility model is expressed.

[0038] Fig.11 The schematic diagram of the structure of the side formwork for casting the longitudinal concrete ribs in the utility model is expressed. DETAILED DESCRIPTION

[0039] The following description is given to enable those skilled in the art to implement and use the utility model and incorporate it into specific application contexts. Various modifications, as well as various uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Thus, the utility model is not limited to the embodiments given herein, but should be granted the broadest scope consistent with the principles and novel features disclosed herein.

[0040] In the following detailed description, many specific details are set forth to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the practice of the present invention need not be limited to these specific details. In other words, well-known structures and devices are shown in block diagram form without detailed display to avoid obscuring the present invention.

[0041] The reader is reminded of all documents and literature filed simultaneously with this specification and open to public inspection, and the contents of all such documents and literature are incorporated herein by reference. Unless otherwise directly stated, all features disclosed in this specification (including any attached claims, abstracts and drawings) can be replaced by alternative features for achieving the same, equivalent or similar purposes. Therefore, unless otherwise explicitly stated, each feature disclosed is only an example of a group of equivalent or similar features.

[0042] Note that, where used, the symbols left, right, front, back, top, bottom, forward, reverse, clockwise and counterclockwise are used only for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or direction between the various parts of the object. In addition, the terms "first" and "second" are used only for descriptive purposes and should not be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Note that, in the case of use, further, preferably, further and more preferably are simple beginnings for explaining another embodiment based on the previous embodiment, and the content of further, preferably, further or more preferably followed by the above embodiment is combined with the previous embodiment as a complete composition of another embodiment. Several further, preferably, further or more preferably settings followed by the same embodiment can be arbitrarily combined to form another embodiment.

[0045] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention.

[0046] First, this embodiment introduces the drawings one by one:

[0047] Figure 1 The schematic diagram of the structure of the prefabricated part of the concrete composite slab of the utility model is expressed; Figure 1 The cast-in-place layer 5 is not shown, but the prefabricated part formed after prefabrication in the workshop is shown.

[0048] Figure 2 The schematic diagram of reinforcement of the longitudinal composite ribs, transverse frame and bottom plate in the concrete composite slab of the utility model is expressed; Figure 2 In order to conveniently display the reinforcement positions of the bottom plate, longitudinal composite ribs and transverse frames, the longitudinal concrete ribs of some concrete rib segments are hidden, and the surface layer of the bottom plate is also hidden to expose the internal bottom plate longitudinal steel bars and bottom plate transverse steel bars.

[0049] Figure 3 Expressed Figure 2 A partial enlarged view of the structure to show the location of the transverse frame and steel rib segments.

[0050] Figure 4 Another structural schematic diagram of the prefabricated part of the concrete composite slab of the utility model is expressed, wherein the elevation of the steel rib section is higher than that of the concrete rib section.

[0051] Figure 5 Expressed Figure 4 A partial enlargement of the figure is intended to show the location of the steel rib segments, concrete rib segments and transverse frames.

[0052] Figure 6 The present invention expresses a reinforcement schematic diagram of the longitudinal composite ribs, transverse frames and bottom plate in the concrete composite slab from another perspective, aiming to demonstrate the casting principle of the longitudinal concrete ribs.

[0053] Figure 7 Expressed Figure 6 A partial enlarged view of the figure; it is intended to show that the casting position of the web avoidance and the longitudinal concrete ribs reserves the position space for the side formwork for casting the longitudinal concrete ribs.

[0054] Figure 8 Expressed Figure 6 A partial enlarged view of the figure; it is intended to show the casting position of the web avoidance and the longitudinal concrete ribs, leaving space for the casting side formwork of the longitudinal concrete ribs, and also shows the position of the concrete rib structural reinforcement and the transverse frame.

[0055] Fig. 9 The front schematic diagram of the concrete composite slab of the utility model is expressed to express the position area of ​​the steel rib section on the bottom plate, with the midpoint reference line as the main point. 钢肋段 ≤2 / 3d 总长 , where d 总长 is the total length of the bottom plate, d 钢肋段 The total length of the area where the steel rib section extends symmetrically on both sides with the midpoint reference line as the main part; Fig. 9 The cast-in-place layer is shown in Figure 1, and a protective layer should be left between the cast-in-place layer and the top of the precast part.

[0056] Fig.10 A structural schematic diagram of the steel rib section in the utility model is expressed.

[0057] Fig.11 The schematic diagram shows the location and installation of the side formwork for pouring the longitudinal concrete ribs.

[0058] See also Figures 1 to 11The utility model first provides a concrete composite slab, which includes a bottom plate 1, a longitudinal composite rib and a cast-in-place layer 5. The longitudinal composite rib is arranged on the bottom plate 1 and formed on the plate surface of the bottom plate 1. The longitudinal composite rib includes at least two sections of concrete rib segments 2 and one section of steel rib segment 4. The steel rib segment 4 is connected between the two sections of concrete rib segments 2 to form a through-length structure. The steel rib segment 4 is located with the midpoint of the plate length of the bottom plate 1 as the reference, and extends symmetrically to both ends within a range of 2 / 3 of the total plate length (regardless of whether the number of steel rib segments 4 is one or more, this range should be met); a pipe penetration space 40 is formed in the steel rib segment 4; the cast-in-place layer 5 is cast on the bottom plate 1 on site, and at least covers the concrete rib segment 2 and the steel rib segment 4. This solution sets a longitudinal composite rib of a concrete rib segment 2 and a steel rib segment 4. Since the compressive and especially tensile strength of steel is much greater than that of concrete, although the cross-sectional area of ​​the steel rib segment here is much smaller than that of the concrete rib segment, the compressive and tensile bearing capacity is not reduced. In this way, a larger pipe penetration space 40 is formed through the steel rib segment 4, and the compressive or tensile resistance is improved, thereby improving the rigidity of the composite plate and making it less likely for cracks to occur in the ribs. Thus, it is achieved that sufficient pipe penetration space 40 can be provided while maintaining the shear resistance of the structure.

[0059] This solution is used as a one-way plate when only longitudinal composite ribs are provided. As a preferred implementation of this embodiment, this solution can also be used as a two-way plate. Specifically, this embodiment provides a specific diagram of the two-way plate structure. Please refer to Figure 1 and Figure 2 , this embodiment further includes a transverse frame 3, the bottom of which is buried in the bottom plate 1, and the top of which is straddling the steel rib segment 4 and / or the concrete rib segment 2. Here, "and / or" is interpreted as the top of the transverse frame 3 straddling the steel rib segment 4; or the top of the transverse frame 3 straddling the concrete rib segment 2; or when there are multiple transverse frames 3, the top of one of the transverse frames 3 straddling the steel rib segment 4, and the top of one of the transverse frames 3 straddling the concrete rib segment 2.

[0060] Further, please combine Figure 6 and Figure 8 The concrete rib section 2 includes a concrete rib longitudinal structural rib 21 and a longitudinal concrete rib 22. The longitudinal concrete rib 22 is formed on the plate surface of the bottom plate 1 through the concrete rib longitudinal structural rib 21. The concrete rib longitudinal structural rib 21 is connected to the longitudinal concrete rib 22 and the bottom plate 1. Preferably, the concrete rib longitudinal structural rib 21 is a wave-shaped steel bar, the trough of which is cast and buried in the bottom plate 1, and the crest of which is cast and buried in the longitudinal concrete rib 22. More preferably, when the bottom plate longitudinal steel bars 11 and the bottom plate transverse steel bars 12 are arranged, part of the bottom plate transverse steel bars 12 pass through the trough of the concrete rib longitudinal structural rib 21.

[0061] Please combine Figure 6 and Figure 7When used as a two-way slab, the transverse frame 3 includes at least an upper chord 31 and a web member 32. In the transverse frame 3 spanning the concrete rib segment 2, the web member 32 forms a web member avoidance opening 320 at the concrete rib segment 2, and the web member avoidance opening 320 can at least be covered by the casting side formwork 23 of the concrete rib segment 2 (see Fig.11 ) through. Further, the transverse frame 3 is preferably a triangular frame, including an upper chord 31 and a triangularly supported wavy web member group; it should not be limited that the transverse frame 3 can also adopt other structural forms, such as a single-row frame, etc., and the triangular frame is the best choice here. The wavy web member group forms a discontinuous structure at the web member avoidance 320, so that part of the web member 32 is buried in the longitudinal concrete rib 22 to form a connection effect, and the width of the web member avoidance 320 at the discontinuous part should be slightly larger than the width of the longitudinal concrete rib 22, so as to facilitate the casting side mold 23 of the concrete rib segment 2 to pass through.

[0062] Preferably, the casting side form 23 is made of L-shaped steel plate, which can be Fig.11 As shown, it is stably placed on the base plate 1.

[0063] Furthermore, please combine Figure 2 and Figure 3 When the transverse frame 3 is arranged, part of the bottom plate transverse reinforcement 12 passes through the bottom of the transverse frame 3. Specifically, a reinforcement portion 321 is formed at the trough of the corrugated web member 32 group of the transverse frame 3, and part of the bottom plate transverse reinforcement 12 passes through the reinforcement portion 321, that is, it is laid on the reinforcement portion 321. Preferably, the reinforcement portion 321 is a bent shape extending outward; the bottom plate transverse reinforcement 12 passes through the bottom trough of the transverse frame 3, and finally the bottom plate 1 concrete is poured to form the bottom plate 1. The transverse frame 3 is provided with a bent reinforcement portion 321 to avoid the lower chord, which can save steel and facilitate the reinforcement of the prefabricated part of the integral composite plate.

[0064] Please combine Figure 1 , Figure 2 , Figure 3 and Fig. 9, the steel rib segment 4 is the core component of this embodiment, which is preferably an inverted U-shaped steel plate, and the two ends of the inverted U-shaped steel plate are respectively fixed with bolts 41, and the two ends of the inverted U-shaped steel plate are respectively connected to the concrete rib segment 2 through the bolts 41; the above-mentioned pipe-through space 40 is formed in the U-shaped space of the inverted U-shaped steel plate. Further, the inverted U-shaped steel plate includes a top plate 42 and side plates 43 on both sides, and the top plate 42 plays a role in compression or tension. Among them, the two ends of the inverted U-shaped steel plate are implemented as the end molds of the concrete rib segment 2; that is, the side plate 43 is implemented as the end mold of the concrete rib segment 2. It should be noted that in this embodiment, the inverted U-shaped steel plate is a preferred embodiment, and it can also be provided with multiple connecting rods at the bottom opening to form a closed structure; the side plates 43 and the top plate 42 can be implemented as a whole plate, or as a plurality of parallel strips. The role of the steel rib segment 4 is to provide compression and tension resistance at the top and the end mold of the side, and to connect the concrete rib segment 2.

[0065] The connection between the steel rib segment 4 and the concrete rib segment 2 by the bolt 41 is also only a preferred method of this embodiment. When the concrete rib longitudinal structural rib 21 is implemented as a corrugated steel bar or a truss bar, the concrete rib longitudinal structural rib 21 is directly welded to the steel rib segment 4, so that the bolt 41 can be omitted. Preferably, when the steel rib segment 4 is an inverted U-shaped steel plate, the two ends of the inverted U-shaped steel plate are respectively welded to the concrete rib longitudinal structural rib 21. That is, the purpose is to enable the steel rib segment 4 to be fixedly connected to the concrete rib segment 2.

[0066] For further information, see Figure 4 and Figure 5 The top elevation of the steel rib segment 4 can be the same as that of the concrete rib segment 2, or slightly higher than that of the concrete rib segment 2, thereby increasing the pipe insertion space 40. When the top elevation of the steel rib segment 4 is slightly higher than that of the concrete rib segment 2, the transverse frame 3 is arranged across the concrete rib segment 2, that is, located on both sides of the steel rib segment 4.

[0067] It should be noted that the steel rib segment can also be used as a steel plate and arranged on a common concrete rib segment, that is, a steel plate is embedded in the longitudinal concrete rib, and the web member of the transverse frame does not need to be embedded here. The upper chord of the transverse frame is directly welded to the embedded steel plate, which can also form continuous force transmission. This is an alternative method of this embodiment. Although it is not shown in the figure, technical personnel in this field should be able to draw the conclusion without any doubt based on the text description.

[0068] Please combine Figures 1 to 11 In order to describe the structural forming principle and advantages of the concrete composite slab in this embodiment in more detail, this embodiment also records its forming method, which includes a prefabrication stage and a construction stage. The specific prefabrication stage and the construction stage are described in detail as follows:

[0069] S1 prefabrication stage:

[0070] S101 base plate 1 molding: For details, please combine Figure 6 , Figure 7 and Figure 8 , lay the bottom plate longitudinal steel bars 11 on the formwork platform, lay the concrete rib longitudinal structural bars 21, lay the inverted U-shaped steel plate, and place the inverted U-shaped steel plate on the bottom plate longitudinal steel bars 11; then lay the transverse frame 3, lay the bottom plate transverse steel bars 12, part of the bottom plate transverse steel bars 12 passes through the bottom of the concrete rib longitudinal structural bars 21, and part of the bottom plate transverse steel bars 12 passes through the bottom of the transverse frame 3; finally, pour the bottom plate 1 concrete to form the bottom plate 1.

[0071] The concrete of the bottom plate 1 is made of high performance concrete, fiber concrete, etc., which is not limited here.

[0072] Please combine Figure 6 and Figure 8 The longitudinal structural reinforcement 21 of the concrete rib is a wave-shaped steel bar, the trough of which is cast and buried in the bottom plate 1, and the crest of which is cast and buried in the longitudinal concrete rib 22. More preferably, when the longitudinal reinforcement 11 and the transverse reinforcement 12 of the bottom plate are arranged, part of the transverse reinforcement 12 of the bottom plate passes through the trough of the longitudinal structural reinforcement 21 of the concrete rib.

[0073] Please combine Figure 6 and Figure 7 When used as a two-way slab, the transverse frame 3 includes at least an upper chord 31 and a web member 32. In the transverse frame 3 spanning the concrete rib segment 2, the web member 32 forms a web member avoidance opening 320 at the concrete rib segment 2, and the web member avoidance opening 320 can at least be covered by the casting side formwork 23 of the concrete rib segment 2 (see Fig.11 ) through. Further, the transverse frame 3 is preferably a triangular frame, including an upper chord 31 and a triangularly supported wavy web member group; it should not be limited that the transverse frame 3 can also adopt other structural forms, such as a single-row frame, etc., and the triangular frame is the best choice here. The wavy web member group forms a discontinuous structure at the web member avoidance 320, so that part of the web member 32 is buried in the longitudinal concrete rib 22 to form a connection effect, and the width of the web member avoidance 320 at the discontinuous part should be slightly larger than the width of the longitudinal concrete rib 22, so as to facilitate the casting side mold 23 of the concrete rib segment 2 to pass through.

[0074] Furthermore, please combine Figure 2 and Figure 3When the transverse frame 3 is arranged, part of the bottom plate transverse reinforcement 12 passes through the bottom of the transverse frame 3. Specifically, a reinforcement portion 321 is formed at the trough of the corrugated web member 32 group of the transverse frame 3, and part of the bottom plate transverse reinforcement 12 passes through the reinforcement portion 321, that is, it is laid on the reinforcement portion 321. Preferably, the reinforcement portion 321 is a bent shape extending outward; the bottom plate transverse reinforcement 12 passes through the bottom trough of the transverse frame 3, and finally the bottom plate 1 concrete is poured to form the bottom plate 1. The transverse frame 3 is provided with a bent reinforcement portion 321 to avoid the lower chord, which can save steel and facilitate the reinforcement of the prefabricated part of the integral composite plate.

[0075] Please combine Figure 1 , Figure 2 , Figure 3 and Fig. 9 , the two ends of the inverted U-shaped steel plate are respectively fixed with bolts 41, and the two ends of the inverted U-shaped steel plate are respectively connected to the concrete rib segment 2 through the bolts 41; the inverted U-shaped steel plate as the steel rib segment 4 is located with the midpoint of the plate length as the reference, and extends symmetrically to both ends within the range of 2 / 3 of the total plate length; the above-mentioned pipe-through space 40 is formed in the U-shaped space of the inverted U-shaped steel plate. Further, the inverted U-shaped steel plate includes a top plate 42 and side plates 43 on both sides, and the top plate 42 plays a shearing role (compression or tension). Among them, the two ends of the inverted U-shaped steel plate are implemented as the end molds of the concrete rib segment 2; that is, the side plates 43 are implemented as the end molds of the concrete rib segment 2. It should be noted that in this embodiment, the inverted U-shaped steel plate is a preferred embodiment, and it can also be provided with multiple connecting rods at the bottom opening to form a closed structure; the side plates 43 and the top plate 42 can be implemented as a whole plate, or as a plurality of parallel strips. The steel rib segment 4 is used to provide shear resistance at the top and end formwork at the side, and to connect the concrete rib segment 2 .

[0076] The connection between the steel rib segment 4 and the concrete rib segment 2 by the studs 41 is also only a preferred mode of this embodiment. When the concrete rib longitudinal structural ribs 21 are implemented as corrugated steel bars or truss bars, the concrete rib longitudinal structural ribs 21 are directly welded to the steel rib segment 4, so that the studs 41 can be omitted. Preferably, when the steel rib segment 4 is an inverted U-shaped steel plate, the two ends of the inverted U-shaped steel plate are respectively welded to the concrete rib longitudinal structural ribs 21.

[0077] For further information, please refer to Figure 4 and Figure 5 The top elevation of the steel rib segment 4 can be the same as that of the concrete rib segment 2, or slightly higher than that of the concrete rib segment 2, thereby increasing the pipe insertion space 40. When the top elevation of the steel rib segment 4 is slightly higher than that of the concrete rib segment 2, the transverse frame 3 is arranged across the concrete rib segment 2, that is, located on both sides of the steel rib segment 4.

[0078] S102 longitudinal composite rib forming: setting the casting side form 23 of the longitudinal composite rib, the casting side form 23 passes through the transverse frame 3, and clamps the inverted U-shaped steel plate for positioning, and then casts the longitudinal concrete rib 22 to form the concrete rib segment 2. After the concrete reaches a certain strength, the casting side form 23 is removed, and a pipe passing space 40 is formed at the inverted U-shaped steel plate.

[0079] Furthermore, a casting side form 23 of a full-length structure is provided on both sides of the concrete rib segment 2 and the steel rib segment 4, and multiple concrete rib segments 2 are formed at one time during the secondary casting of the concrete rib segment 2; after removing the casting side form 23, the U-shaped space of the steel rib segment 4 of the inverted U-shaped steel plate naturally forms a pipe-through space 40. Both ends of the inverted U-shaped steel plate are implemented as end forms of the longitudinal concrete rib 22, and both sides of the inverted U-shaped steel plate are used as positioning plates for the casting side form 23.

[0080] In the above-mentioned prefabrication stage, the bottom plate and the longitudinal composite ribs form a prefabricated part which is prefabricated in batches at the factory.

[0081] S2 Construction Phase:

[0082] Specifically, the prefabricated parts formed in the prefabrication stage are transported to the construction site for installation, the electromechanical and electrical conduits are arranged through the pipe-through space 40, the on-site steel bars (the steel bars of the cast-in-place layer 5 slab) are laid, and the cast-in-place layer 5 is poured. The cast-in-place layer 5 at least covers the concrete rib segment 2 and the steel rib segment 4 to form a concrete composite slab.

[0083] Beneficial effects of this technical solution:

[0084] This application is prefabricated before construction. The longitudinal composite ribs are divided into steel rib sections and concrete rib sections by an inverted U-shaped steel plate. The inverted U-shaped steel plate provides continuous compression or tension resistance for the ribs, and forms a pipe-through space to meet wiring requirements.

[0085] The present application arranges a longitudinal composite rib of a concrete rib segment 2 and a steel rib segment, forms a larger pipe-passing space through the steel rib segment, and improves the compression or tension resistance, thereby maintaining the consistency of the bearing capacity of the composite plate ribs, so that the composite plate will not have a reduced bending resistance at the pipeline crossing point, thereby achieving the characteristics of providing sufficient pipe-passing space and maintaining the composite plate structure without weak bending links.

[0086] A transverse frame 3 and a longitudinal combined rib can be arranged to form a bidirectional plate. The bottom of the web member 32 of the transverse frame 3 is hooked on the structural reinforcement of the bottom plate. Eliminating the use of lower chord steel can not only save steel but also realize the operable installation of the transverse frame 3 (if there is a lower chord reinforcement, the installation and positioning cannot be completed due to the obstruction of the longitudinal reinforcement of the floor slab).

[0087] The shear force of the composite slab is large at both ends and small in the middle; the steel rib section is arranged on the bottom plate where the shear force is smaller than the ends, that is, close to the middle, which just matches the characteristics of the inverted U-shaped rib having good force transmission capacity along the longitudinal direction of the floor slab but poor vertical shear resistance.

[0088] The transverse frame 3 can span the steel rib segment and the concrete rib segment 2; when spanning the concrete rib segment 2, the web member of the transverse frame 3 is partially buried in the concrete rib segment 2 to form a tie; at the same time, the web member forms a web member avoidance 320 to facilitate the support of the casting side formwork 23 of the concrete rib segment. When spanning the steel rib segment, the web member is just located in the inverted U-shaped groove of the steel rib.

[0089] The steel rib segment is fixed to two adjacent concrete rib segments 2 by bolts. When the concrete rib segment 2 is poured, the steel rib segment can be used as an end mold of the concrete rib segment 2.

[0090] The steel rib section is an inverted U-shaped steel plate. The top can play a compressive or tensile role. The two sides serve as the end molds of the concrete rib section. The internal space naturally forms a pipe-through space, and the space is sufficient for the layout of conventional pipelines. It is convenient for pipelines to pass through at a certain angle, unlike the traditional concrete rib openings that can only be right angles; it is more convenient for wiring. For example, for a conventional 130mm floor slab, the bottom plate thickness is 35mm, the rib top space is 25mm, and the steel plate thickness is 10mm, then the pipe-through space can reach 60mm. However, due to the need to maintain the continuity of the force transmission of the concrete ribs, the pipe-through space of conventional concrete rib composite slabs is limited to a maximum height of 30mm. The actual pipe-through on site is very difficult, which makes it impossible to promote conventional (truss-free) concrete rib slabs.

[0091] Compared with the traditional concrete rib composite slab, the steel frame of the present application connects the bottom plate with the secondary cast concrete ribs, preventing the concrete ribs from peeling off from the bottom plate; at the same time, the setting of the transverse frame 3 makes the composite slab have a strong transverse bending resistance, and a composite slab with a width of more than 4m can be produced, avoiding the occurrence of floor joints in the room. The width of conventional composite slabs generally does not exceed 3m, which cannot reach the width of the room span, resulting in floor joints in the room.

[0092] Furthermore, the utility model is described in detail above in conjunction with the embodiments of the drawings, and a person skilled in the art can make various variations of the utility model according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the utility model, and the scope of protection of the utility model shall be defined by the scope of the attached claims.

Claims

1. A concrete composite slab, characterized in that: include: Base plate; A longitudinal composite rib, the longitudinal composite rib is arranged on the bottom plate and formed on the plate surface of the bottom plate, the longitudinal composite rib comprises at least two concrete rib sections and one steel rib section, the steel rib section is connected between the two concrete rib sections to form a through-length structure; the steel rib section is located with the midpoint of the plate length of the bottom plate as the reference, and extends symmetrically to both ends within a range of 2 / 3 of the total plate length; a pipe penetration space is formed in the steel rib section; A cast-in-place layer is cast on the base plate at the construction site and covers at least the concrete rib segment and the steel rib segment.

2. The concrete composite slab according to claim 1, characterized in that: It also includes a transverse frame, the bottom of which is buried in the bottom plate, and the top of which spans the steel rib segment and / or the concrete rib segment.

3. The concrete composite slab according to claim 2, characterized in that: The concrete rib section includes a longitudinal concrete rib structural rib and a longitudinal concrete rib. The longitudinal concrete rib is formed on the plate surface of the base plate through the longitudinal concrete rib structural rib. The longitudinal concrete rib structural rib is connected to the longitudinal concrete rib and the base plate.

4. The concrete composite slab according to claim 3, characterized in that: The transverse frame includes at least an upper chord and a web member; in the transverse frame spanning the concrete rib segment, the web member forms a web member avoidance opening at the concrete rib segment; the web member avoidance opening can at least be passed by the casting side formwork of the concrete rib segment.

5. The concrete composite slab according to claim 4, characterized in that: The web member is partially buried in the longitudinal concrete rib at the web member avoidance opening.

6. The concrete composite slab according to claim 3, characterized in that: The steel rib section is an inverted U-shaped steel plate, both ends of which are fixed with bolts, and both ends of the inverted U-shaped steel plate are connected to the concrete rib section through the bolts; the pipe penetration space is formed in the U-shaped space of the inverted U-shaped steel plate.

7. The concrete composite slab according to claim 6, characterized in that: The elevation of the steel rib segment is higher than that of the concrete rib segment.

8. The concrete composite slab according to claim 6, characterized in that: Both ends of the inverted U-shaped steel plate are implemented as end molds of the concrete rib segment.

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